package com.itheima.filter;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;


//@WebFilter(urlPatterns = "/*")
public class DemoFilter implements Filter {
    @Override //初始化，只调用一次
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("init 初始化执行了");
    }

    @Override   //拦截到请之后调用 调用多次
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("Demo 拦截到了请求,放行前");
        //放行
        chain.doFilter(request,response);

        System.out.println("Demo 拦截到了请求,放行后");
    }

    @Override   //销毁，只调用一次
    public void destroy() {
        System.out.println("destroy 销毁方法执行了，");
    }
}
